<script setup>
    import {ref,computed, reactive,toRefs} from 'vue'
    import {useRouter} from 'vue-router'
    const router = useRouter()
    import Product from '@/components/shop/Product.vue';
    import userCartStore from '@/stores/cart.js'
    const props = defineProps(['shopName'])
    const cartStore = userCartStore()
    
    const isShow = ref(false)

    // 获取当前购物车
    // 有购物车(list是否有值) 没有购物车
    const shopCart = computed(()=>{   // ComputedRefImpl --> .value     RefImpl-->.value    Proxy -->不需要通过value来获取
        return cartStore.cartList.find(item => item.name === props.shopName)
    })

    // 获取当前购物车商品内容(list)
    const shopCartList = computed(()=>{
        // 判断当前购物车是否存在
        if(shopCart.value){
            return shopCart.value.list
        }else{
            return []
        }
        
    })

    // 全部商品的数量
    const cartListCount = computed(()=>{
        // reduce
        if(shopCart.value){
            return shopCart.value.list.reduce((sum,item)=>sum + item.number,0)
        }else{
            return 0
        }
    })

    // 被选中商品列表
    const shopCartCheckedList = computed(()=>{
        if(shopCart.value){
            return shopCart.value.list.filter(item => item.checked)
        }else{
            return []
        }
    })

    // 获取被选中商品的数量
    const shopCartCountChecked = computed(()=>{
        return shopCartCheckedList.value.reduce((sum,item)=>sum+item.number,0)
    })

    // 全选
    const checkAll = computed({
        get(){
            // 小控制大
            return shopCartList.value.every(item => item.checked)
        },
        set(data){
            // 大控制小
            shopCartList.value.forEach(item =>{
                item.checked = data
            })
        }
    })

    // 总计
    const total = computed(()=>{
        return shopCartCheckedList.value.reduce((sum,item)=>sum + item.price * item.number,0).toFixed(2)
    })

    // 清空购物车
    const cleanCart = ()=>{
        // 将购物车中所有商品的number设为0
        shopCart.value.list.forEach(item => item.number = 0)
        // 整个购物车删除
        cartStore.cartList = cartStore.cartList.filter(item => item !== shopCart.value)
    }

    // 结算
    const orderConfirm = ()=>{
        router.push({
            path:'/orderConfirm',
            query:{
                shopName:props.shopName
            }
        })
    }




    // const cartListCountChecked = computed(()=>{
    //     if(shopCart.value){
    //         let sum = 0
    //         shopCart.value.list.forEach(item => {
    //             if(item.checked){
    //                sum += item.number
    //             }
    //         })
    //         console.log(sum)
    //         return sum
    //     }else{
    //         return 0
    //     }
    // })

    /**
     * 
     * 
     * 
     * 
     * 
     * 
     * 
    */



    // let curShopCart = ref(null)
    // // 判断底部是否显示空购物车
    // const isShow = computed(()=>{
    //     //获取当前店铺的购物车
    //   curShopCart.value = cartStore.cartList.find(item => item.name === props.shopName )
    //   if(curShopCart.value){
    //     if(curShopCart.value.list.length > 0){
    //       return false
    //     }else{
    //       return true
    //     }
    //   }else{
    //     return true
    //   }
    // })

    // // 处理数量标签(tag)
    // const cartTag = computed(()=>{
    //   if(curShopCart.value){
    //     return curShopCart.value.list.reduce((sum,item)=>{
    //       return sum + item.number
    //     },0)
    //   }
    // })

</script>

<template>
    <div class="cart">
        <!-- mask遮罩 -->
        <div class="cart_mask" v-if="isShow" @click="isShow =!isShow"></div>

        <div class="cart_product" v-if="isShow">
            <div class="cart_product_header" v-if="cartListCount > 0">
                <div class="cart_product_header_allChecked">
                    <input type="checkbox" class="circle-checkbox" v-model="checkAll"> 全选
                </div>
                <div class="cart_product_header_clear" @click="cleanCart">清空购物车</div>
            </div>
            <div class="cart_product_list">
                <div class="cart_product_list_item" v-for="item in shopCartList" :key="item.id">
                    <div class="checkbox">
                        <!-- <input type="checkbox" class="circle-checkbox" :checked="item.checked" @change="changeChecked(item)" name="" id=""> -->
                        <input type="checkbox" class="circle-checkbox" v-model="item.checked">
                    </div>
                    <div class="content" >
                        <Product min="min" :productInfo="item" :shopName="props.shopName"/>
                    </div>
                </div>
            </div>
        </div>

        <div class="cart_check">
            <div class="cart_check_icon" @click="isShow = !isShow">
                <img src="http://www.dell-lee.com/imgs/vue3/basket.png" alt="" >
                <span class="tag" v-show="shopCartCountChecked > 0">{{ shopCartCountChecked }}</span>
            </div>
            <div class="cart_check_empty" v-if="cartListCount == 0">
              购物车是空的
            </div>
            <div class="cart_check_content" v-else>
                <div class="cart_check_content_total_price">总计 : <span class="check_content_total_price_number">￥{{ total }}</span></div>
                <div class="cart_check_content_submit" @click="orderConfirm">结算</div>
            </div>
        </div>
    </div>
</template>

<style lang="scss" scoped>
@import "@/style/viriables.scss";
.cart {
    &_mask {
        position: absolute;
        top: 0;
        bottom: .5rem;
        left: 0;
        right: 0;
        background-color: rgba($color: #000000, $alpha: .4);
    }

    &_product {
        width: 100%;
        position: absolute;
        left: 0;
        bottom: .5rem;
        background-color: $bgColor;

        //圆形复选框
        /* 设置选中背景 */
        .circle-checkbox:checked {
            background: #1673ff;
        }

        /* 设置复选框样式 */
        .circle-checkbox {
            width: .2rem;
            height: .2rem;
            background-color: #ffffff;
            border: solid 1px $light-fontColor;
            -webkit-border-radius: 50%;
            border-radius: 50%;
            font-size: 0.8rem;
            margin: 0;
            padding: 0;
            position: relative;
            display: inline-block;
            vertical-align: top;
            cursor: default;
            -webkit-appearance: none;
            -webkit-user-select: none;
            user-select: none;
        }

        /* 设置伪类，即显现的对勾样式 */
        .circle-checkbox:checked::after {
            content: "";
            top: 5px;
            left: 4px;
            position: absolute;
            background: transparent;
            border: #fff solid 2px;
            border-top: none;
            border-right: none;
            height: 3px;
            width: 8px;
            -moz-transform: rotate(-45deg);
            -ms-transform: rotate(-45deg);
            -webkit-transform: rotate(-45deg);
            transform: rotate(-45deg);
        }

        &_header {
            padding: .18rem;
            display: flex;
            justify-content: space-between;
        }

        &_list {
            max-height: 3rem;
            overflow-y: scroll;

            &_item {
                display: flex;

                .checkbox {
                    display: flex;
                    align-items: center;
                    margin-left: .18rem;  
                }

                .content {
                    flex: 1;
                    width: 100%;
                }
            }
        }
    }

    &_check {
        width: 100%;
        height: .49rem;
        border-top: .01rem solid $content-bgColor;
        position: absolute;
        left: 0;
        bottom: 0;
        display: flex;
        // 购物车图标
        &_icon {
            width: .84rem;
            height: .49rem;
            display: flex;
            justify-content: center;
            align-items: center;
            position: relative;
            img {
                 width: .28rem;
                height: .26rem;
            }

            .tag {
                display: inline-block;
                width: .15rem;
                height: .15rem;
                border-radius: 50%;
                background-color: $hightlight-fontColor;
                color: $bgColor;
                font-size: .1rem;
                text-align: center;
                position: absolute;
                top: .05rem;
                right: .18rem;
            }
           
        }
        // 空购物车
        &_empty {
            line-height: .49rem;
        }
        // 总价
        &_content {
            flex: 1;
            display: flex;
            position: relative;
            width: 100%;

            &_total_price {
                flex: 1;
                line-height: .49rem;
                color: $hightlight-fontColor;

                &_number {
                    font-size: .18rem;
                }
            }
            &_submit {
                width: .98rem;
                height: .49rem;
                background-color: $btn-bgColor;
                color: $bgColor;
                text-align: center;
                line-height: .49rem;
            }
        }
    }
}
</style>